Disclosure: we make Goodnight Journal, so we are not a neutral party here. We have tried to write the comparison we would want to read — including the cases where the other app is the better choice.
Penzu and Goodnight Journal get compared often, and it makes sense: both are web-first online journals, both have been around a long time, and both are built around private writing rather than social posting. If you are choosing between them, the decision comes down to one question, and it is not about features.
The short version
Penzu is a sealed private diary. Nothing you write is ever intended to be seen by anyone.
Goodnight Journal is a private diary that you can open a door in. Entries are private by default, and you can publish individual ones to a community of other journal writers if you want to.
That is the whole difference, and it should decide your choice.
Where Penzu is the better pick
Be honest with yourself about this one. If the thought of any entry ever being visible makes you uneasy — even as an option you would never use — Penzu is the right answer. A tool with no sharing feature is a different psychological object from one that has sharing turned off, and that difference is real.
Penzu is also the better fit if you want something deliberately plain. Its writing view has barely changed in years, which is a criticism in some reviews and the entire appeal in others. There is nothing to configure and nothing to be distracted by.
And it has longevity on its side. Penzu has outlasted a long list of journaling startups, which is not nothing when you are deciding where to keep ten years of your life.
Where Goodnight Journal is the better pick
You have abandoned a private journal before. This is the most common reason people switch to us, and it is worth being blunt about: a sealed journal asks you to write with no response of any kind, forever. Plenty of people manage that. Plenty of others quietly stop after three weeks and feel bad about it.
Being able to occasionally post an entry — and read what other people have posted — changes the experience. Writing something you thought was shameful and finding four strangers who have written almost the same thing is a specific kind of relief a locked notebook cannot give you.
You want to read other people’s journals. There is a reason the online journal communities of the early 2000s had such devoted users. Reading unvarnished writing about ordinary life is compelling in a way that curated social media is not. Goodnight Journal has that; Penzu does not.
You write across several devices. Both work on desktop and mobile. We have put particular effort into the experience being genuinely the same on each — starting an entry on a laptop and finishing it on a phone should not feel like using two different products.
What they share
Neither is a mood tracker. Neither is a bullet journal. Neither is trying to be a note-taking app with a journal mode bolted on. Both are for writing about your life in sentences, and both treat your entries as private unless you say otherwise.
If you are weighing either of them against something like Daylio or Day One, you are really choosing between writing and logging — see our best personal journal apps roundup for that comparison.
How to decide in five minutes
Ask yourself what stopped you last time.
If it was privacy — if you could not write freely because you were aware of the notebook sitting there — pick Penzu, or honestly either, because both keep entries private.
If it was that writing into a void stopped feeling worth it, pick Goodnight Journal. That is the problem we exist to solve.
Both let you start writing without committing to anything, so the genuinely sensible move is to try each for a week and notice which one you open without reminding yourself to.